Apple has released a software update for QuickTime for people running older versions of the Mac OS operating system, as well as Quicktime for Windows.
With much of the focus on Mac OS X Lion these days, it's easy to forget that some Mac users still run older versions of the Mac operating system, older as in Mac OS X 10.5.
QuickTime 7.7 for Leopard is solely a security update. Apple provides few details about specific issues addressed by the 68.85MB download in its release notes, but it promises information "on the security content of this update" for users who want to dig into this support document.
As for Windows users, there's a QuickTime update for your operating system, too. QuickTime 7.7 for Windows promises security improvements for anyone running Windows XP (SP2 or later), Vista or Windows 7.